(石家莊鐵道學(xué)院材料科學(xué)與工程研究所, 石家莊 050043)
摘 要: 通過對采用半固態(tài)攪拌-液態(tài)模鍛工藝制備的SiCp/Al合金基復(fù)合材料室溫拉伸性能的研究，分析了這種復(fù)合材料屈服強度和極限強度提高的原因，對顆粒增強復(fù)合材料的強化機理進行了探討；同時，采用掃描電子顯微鏡對材料的拉伸斷口進行了觀察，發(fā)現(xiàn)復(fù)合材料及未增強基體合金的斷裂雖均屬于塑性斷裂與脆性斷裂的混合型模式，但隨著SiC顆粒在復(fù)合材料中的體積分?jǐn)?shù)的增加，脆性斷裂特征變得更為顯著。
關(guān)鍵字: SiCp/Al合金基復(fù)合材料 拉伸性能 斷口形貌
（The Institute of Materials Science and Engineering,
Shijiazhuang Railway Institute, Shijiazhuang 050043, P. R. China）
Abstract:The room temperature tensile properties of SiCp/Al alloy composites, which were fabricated by semisolid slurry-stirring and squeeze-casting, were investigated. The reasons for increasing the yield strength and ultimate tensile strength of the composites were analyzed. The fracture morphology of tensile test bars was studied with scanning electron microscope. The SEM fractographic observations of the tested bars showed that the failure of both the composites and the unreinforced matrix-alloy is of mixed mode of ductile fracture and brittle fracture, while the morphologic features of brittle fractures get more dominant with the increase of SiC particles in composites.
Key words: SiCp/Al alloy composites; tensile properties; fracture morphology
